Rotational Motion (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 71 - 75 of 125
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Question number: 71
» Rotational Motion » Moment of Inertia
Question
Assertion (Ꭺ)
If earth shrink (without change in mass) to half of its present size, length of the day would become 6 % increase.
Reason (Ꭱ)
When the size of the earth will change, its moment of inertia will also change.
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Both Ꭺ and Ꭱ are false |
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| b. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ |
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| c. | Ꭺ is true but Ꭱ is false |
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| d. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ |
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Question number: 72
» Rotational Motion » Moment of Inertia
Question
Two discs of the same material and thickness have radii 0.4 m and 0.8 m. Their moments of inertia about their axes will be in the ratio of
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 1: 81 |
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| b. | 1: 27 |
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| c. | 1: 16 |
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| d. | 1: 3 |
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Question number: 73
» Rotational Motion » Values of Moments of Inertia
Question
Moment of inertia of a ring of mass M = 5 gm and radius R = 2 cm about an axis passing through its edge and parallel to its natural axis is
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 30 gm-cm 2 |
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| b. | 40 gm-cm 2 |
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| c. | 35 gm-cm 2 |
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| d. | 45 gm-cm 2 |
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Question number: 74
» Rotational Motion » Values of Moments of Inertia
Question
A constant torque of 31.4 N-m is exerted on a pivoted wheel. If angular acceleration of wheel is 4π rad/sec 2, then the moment of inertia of the wheel is
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 4.5 kg-m 2 |
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| b. | 5.5 kg-m 2 |
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| c. | 2.5 kg-m 2 |
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| d. | 1.5 kg-m 2 |
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Question number: 75
» Rotational Motion » Moment of Inertia
Question
A disc is of mass M and radius R. The moment of inertia of it about an axis tangential to its edge and in polarize of the disc or parallel to its diameter is
Choices
| Choice (4) | Response | |
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| b. |
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| c. |
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| d. |
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